"There will always be nerves in the back of our minds but you try not to think about it and a few of us have performed in front of big crowds before with some high demanding music."
One of their two songs Island Lady is a Polynesian influenced "light love song".
Hastings Boys' High School head of music Justin Lindsay said they played some creative music and described it as "Poly funk all slashed together".
"I think these guys are a group of talented musicians who perform in different styles and genres."
Another 11 bands will be joining Horizon on stage on Saturday, in what is expected to be a tight contest.
Smokefree Rockquest founder and director Pete Rainey said the final was often the year's biggest youth gig in regional cities.
He said at this level some entrants were already demonstrating the standout factor that would see them achieve music career success.
"It's fascinating for us to look back at success stories like Kimbra, Evermore and Broods where we could see the star factor right back at the regional level.
"Friday and Saturday night's event gives a new cohort of bands the opportunity to take their obsession with music and develop the organisational and stage craft skills that will help them become another Kiwi music success."
Mr Rainey said they were proud that their association with Smokefree had been part of a huge social change in the past 28 years with the number of young kids smoking dropping.
"We are right behind the idea of making NZ smokefree by 2025."
The final kicks off at the Napier Municipal Theatre from 7pm on Saturday.
People can buy tickets via Ticketek, adults $20 and students $10.